Ingot mold



Patented Mar. 3l, 1925.-

Um'naznv s'r...'rr:s rai'rrau'r oFFlcE.

TOM M. GIRDLER, F WOODLAWN, PENI"I'SYL'V'A1\`IA.

' I moor MOLD.

Application led April 9, '1923. Serial No. 630,754`

is a view in'vertical and medial section of 'the lower portion of an ingot mold in which my invention is embodied. Fig. II is a view corresponding to F ig. I, but showing the stool portion only of the mold, and illustrating a variation in detail of construction.

Fig. III is a` fragmentary view in vertical section, on a plane at right angles to that of Fig. II, of the stool rtion of the mold. The plane of section is indicated by the line III-III, Fig. II.

An ingot mold for casting steel ingots includes in its structure stool and mold body.

The mold body is a heavy casting of columnar shape, ordinarily approximately square in cross-section, but with rounded corners, tapering somewhat from bottom to top, and open at its ends. This mold-body is, in preparation for casting, `set on the stool portion, which as its name implies is the supporting member, 'constituting the floor of the mold and carrying the mold body in vertical posit-ion. In the drawings the mold body is indicated at 1 and the stool at 2. Fig. I shows the parts assembled in position for castin and the assembly `will at a glance be un erstood.

Ordinarily the stool is merely a plane surfaced tableflike block, essentiallysquare, and of proper size and provided with four upstanding angular pro'ections with upwardly flaring opposite wal s, projectionssuch as are indicated at 3 in F 1g. II, which serve to guide the heav tutes the mold bo y, and bring it accurately to place, when the mold parts are being assembled, preparatory to casting. l In the use of the ordinary ingot mold, with plane-faced-stool, the ingot which is cast is of course square-ended, and this when In the'- accompanying drawings Fig. I'

casting 1 which constiv itis rolled manifests that phenomenon called in the industry fish-tailing. Tha-t is to say, the plastic body under the action of the rolls elongates unequally; there is more displacementlongitudinally -of the article near thesurface than toward the center. Gnsequently as the body is rolled to billet or other sha-pe there is at the end a considerable portion which is hollow; the superficial parts have elongated relatively and the central part has receded.l This accidental shape in section resembles somewhat a ishs tail; hence the term. This hollow fish-tailed end must be cutoff as scrap.

In order to correct this, and to diminish the length of the iish-tail, or even to climinate it wholly, the stool of the moldv has, by

a now patented invention, been recessed centrally with a saucer-like recess, such as that shown in the ldrawings and marked 4. The effect of such a recess is to produce an ingot with a centrally protruding end,-

spoken of as a bud And the shape is such that the central protrusion makes compensation, more or less complete, for superficialover-rolling, and in the finished article there is relatively little sh-tailing, or perhaps none. And consequently there is not-nearly so much cropping ofi' of scrap.

But even with the mold so improved there is still a very appreciable loss in croppedoff scrap, and this the mill operator would gladly correct. My invention concerns cor- 'cction, and saving of -this still persisting oss.A e

The loss is chiefly due to the fin which inevitably forms in the seam, where the mold 'Abody rests 'upon the stool. The hot metal in casting creeps into this seam. AAnd this'fin is in the subsequent rolling a source of irregularit'y,

amount of scrap in crop ends.

My invention consists in formingV a channel, sunk into thesurface of the stool, into which-the mold body atits lower end eX- tends, and wit-hin which themold'b'ody rests and isl supported, The joint so formed is capable o being luted or otherwise sealed with suitable materiah'to the end'that the lower corner of the ingot cast in the mold will besmooth, and free of projecting fin. The ingot cast in the mold of m invention rollsdown to anarticle free o 4defect because ofterminal fin, and, if my invention.

ysuch as to produce, even with the use of the recessed stool. still an undesirable los 

